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January 28, 2019 17:08
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| db.collection.aggregate([ | |
| { | |
| "$group": { | |
| "_id": { | |
| "$dateToString": { | |
| "format": "%Y-%m-%d", | |
| "date": "$time" | |
| } | |
| }, | |
| "count": { | |
| "$addToSet": "$product" | |
| } | |
| } | |
| }, | |
| { | |
| $addFields: { | |
| "count": { | |
| "$size": "$count" | |
| } | |
| } | |
| } | |
| ]) |
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